- #36
jedishrfu
Mentor
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Yes, that's the one I had too.
Outstanding! Thank you @YoungPhysicist.YoungPhysicist said:3D printed Curta:
http://wudev.digitaltorque.com/2015/04/3d-printing-challenge.html?m=1
LOL on you. Many of us old timers here grew up in the slide rule era. Using a slide rule required the extra mental skill of keeping track of the decimal point in your head. That meant making a mental estimate alongside each calculation. That benefit disappeared when the slide rule died.ali PMPAINT said:Lol, I didn't even know the existence of these calculators (I was born 2003), I can't imagine doing mathematics without digital calculators or computers. I heard that Leibniz and Pascal have made the first calculators, how theirs looked like?
The slide rule never dies if someone is still talking about it.anorlunda said:That benefit disappeared when the slide rule died.
Some of us still do the calculation in our head first, and then check it with a calculator...anorlunda said:Using a slide rule required the extra mental skill of keeping track of the decimal point in your head. That meant making a mental estimate alongside each calculation. That benefit disappeared when the slide rule died.
Yeah, sigh ... I USED to do that but my computing ability is not what it used to be. Of course it never really was what it used to be.berkeman said:Some of us still do the calculation in our head first, and then check it with a calculator...
From Wikipedia:ali PMPAINT said:So wait, how did you calculate trancsendental functions such sin(x), e^x, 2^x, in(x), etc? I mean, you wouldn't use a taylor series for each, would you?
In addition to the logarithmic scales, some slide rules have other mathematical functions encoded on other auxiliary scales. The most popular are trigonometric, usually sine and tangent, common logarithm (log10) (for taking the log of a value on a multiplier scale), natural logarithm (ln) and exponential (ex) scales.
anorlunda said:LOL on you. Many of us old timers here grew up in the slide rule era...
berkeman said:Some of us still do the calculation in our head first, and then check it with a calculator..
That skill is a must-have in my elementary school. You can't finish math tests in timethus can't graduate if you can't multiply two 4 digit numbers in 3 seconds. Not sure what it is like in US.berkeman said:Some of us still do the calculation in our head first, and then check it with a calculator...
No problem. I have more scales on mine than I can understand their labels. Of course you have to know elementary mathematics first! E.g. there is no difference between ##e^x## and ##2^x##.ali PMPAINT said:So wait, how did you calculate trancsendental functions such sin(x), e^x, 2^x, in(x), etc? I mean, you wouldn't use a taylor series for each, would you?
What?! In my country(maybe just my city), some high school students don't even know how to multiply two numbers by hand(They are very bad at mathematics), but they pass anyway...YoungPhysicist said:That skill is a must-have in my elementary school. You can't finish math tests in timethus can't graduate if you can't multiply two 4 digit numbers in 3 seconds. Not sure what it is like in US.
ps: No time for checking with calculators.
That’s the case for Taiwanese elementary schools besides the one I go to.ali PMPAINT said:What?! In my country(maybe just my city), some high school students don't even know how to multiply two numbers by hand(They are very bad at mathematics), but they pass anyway...
What?! How do students pass anyway? Is there a technique which one can use, or should they practice so much so that they can do it? Do they take it seriously?(Our school doesn't take anything serious lol)YoungPhysicist said:That’s the case for Taiwanese elementary schools besides the one I go to.
There were also independent soroban classes in my elementary school. The problems are even harder(8digits divided by 5 dits in 4 secs) because the teachers said we have a calculator, which is just as ridiculous as it sounds.